JSC “Giredmet”, Moscow, Russia:

Yu. A. Karpov, Expert of Quality and Analytics Department, Chief Researcher, e-mail: karpov@giredmet.ru

National University of Science and Technology “MISiS”, Moscow, Russia:

V. B. Baranovskaya, Head of Quality and Analytics Department, Leading Researcher, e-mail: baranovskaya@list.ru

G. G. Devyatykh Institute of Chemistry of High-Purity Substances of Russian Academy of Sciences, Nizhny Novgorod, Russia:

I. D. Kovalev, Professor

Chemically-pure substances are considered as a basic type of substances and materials in modern materials science. The main criterion of chemical purity of the substance is its impurity composition, defined by modern highly sensitive methods of analytical control. There are considered the peculiarities, problems and stages of development of methods of high-purity substance analysis. There is made a definition, that striving for the record sensibility of methods and material purity is not always substantiated because of the high cost of technology and diagnostics. The attention should be payed to metrological provision of the applied methods and the choice of technologically important impurities. The following methods were chosen as a practically suitable modern methods of analytical control of high-purity substances: mass-spectrometry with various ion sources; atomicemission spectroscopy with various excitation sources; atomic-adsorption spectroscopy with various automation sources; combination of the considered methods with efficient methods of impurity concentration. Joint application of these methods makes possible to estimate the complete impurity composition and purity of almost all inorganic substances and materials. Such combined application of several methods, together with expansion of the list of defined impurities solves the problem of metrological provision of analysis without application of standard samples due to the intermethod comparison of obtained results. Special attention is paid to the solving of fundamental problem of use of high-purity substances as individual mole standards with analytical measurements. The obtained information is approved by various experimental materials.
This work was carried out with the co-financing of the Ministry of Education and Science of Russian Federation according to the program of increasing of competitiveness of National University of Science and Technology “MISiS” among the leading global scientific-education centers for 2013–2020 (No. К1-2014-026) and with the support of the Russian Science Foundation (project No. 14-13-00897), Russian Foundation for Basic Research (grants 14-03-00688А, 13-03-00440), Ministry of Education and Science (Agreement No. 14.576.21.0001) (unique identifier of the project is RFMEFI57614X0001).

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